Update Makefile

Fix Travis python3 tests

Author: Willem Jan Faber

Makefile

@@ -6,25 +6,24 @@ doc:
 test: install testENV testOAI testSRU testALTOtoTXT
 
 testENV:
-	python setup.py install
+	python3 setup.py install
 
 testOAI:
-	python2.7 ./test/oai_test.py
+	python3 ./test/oai_test.py
 
 testSRU:
-	python2.7 ./test/sru_test.py
+	python3 ./test/sru_test.py
 
 testALTOtoTXT:
-	python ./test/alto_to_text_test.py
+	python3 ./test/alto_to_text_test.py
 
 clean:
 	rm -rf build
 	rm -rf dist
 	rm -rf kb.egg-info
 	find . -name \*.pyc -exec rm '{}' ';'
-	find . -name "__pycache__" -exec rmdir {} \;
-	rm -rf env/local/lib/python2.7/site-packages/kb-*
+	find . -name "__pycache__" -exec rmdir {} \;	
 	rm README.html
 
 install:
-	python setup.py install
+	python3 setup.py install